Showa Denko K.k.

Kabushiki Kaisha Toshiba

Tohoku University

Gohei Kurokawa

Yuzo Sasaki

Atsushi Hashimoto

Tomoyuki Maeda

Akihiko Takeo

Migaku Takahashi

Shin Saito

Ken Inoue

Chen Xu

Shinichi Ishibashi

Haruhisa Ohashi

Tatsu Komatsuda

Akira Kikitsu

Kenji Shimizu

Shingo Sasaki

A perpendicular magnetic recording medium includes a structure in which at least a soft magnetic backing layer, an underlayer, an intermediate layer, and a perpendicular magnetic recording layer are sequentially laminated on a non-magnetic substrate, in which the soft magnetic backing layer includes at least a soft magnetic film having an amorphous structure, the underlayer includes a first underlayer and a second underlayer laminated in this order from the non-magnetic substrate side, the first underlayer is made of a TiV alloy having an amorphous structure, the second underlayer includes a NiW alloy, the intermediate layer includes Ru or a Ru alloy, the soft magnetic film having an amorphous structure directly contacts the first underlayer, and the first underlayer directly contacts the second underlayer.

Perpendicular magnetic recording medium and magnetic recording and reproducing apparatus

A perpendicular magnetic recording medium includes a soft magnetic underlayer, an underlayer, an intermediate layer, and a perpendicular magnetic recording layer successively stacked on a nonmagnetic substrate. The soft magnetic underlayer includes a soft magnetic layer having an amorphous structure. The underlayer includes a first underlayer, and a second underlayer provided between the first underlayer and the intermediate layer. The first underlayer is made of a TiV alloy having an amorphous structure, and the second underlayer is made of an NiW alloy including at least one element selected from a group consisting of Co, Cu, Al, Cr, and Fe. The intermediate layer is made of Ru or an Ru alloy, and wherein the soft magnetic layer, the first underlayer, and the second underlayer are stacked in this order.

Perpendicular magnetic recording medium and magnetic storage apparatus

A method of manufacturing a magnetic recording medium, includes at least: forming an orientation control layerthat controls orientation of an immediately above layer thereof on a non-magnetic substrate; and forming a perpendicular magnetic layerin which an easy axis of magnetization is mainly perpendicularly orientated to the non-magnetic substrate, in which the forming of the orientation control layerincludes forming a granular layer having a granular structure that includes Ru or a material in which Ru is a main component and an oxide having a melting point which is greater than or equal to 450&#xb0; C. and less than or equal to 1000&#xb0; C., by a sputtering method, and the forming of the perpendicular magnetic layerincludes growing crystal grains to form columnar crystals that are continuous in a thickness direction together with crystal grains that form the orientation control layer

Method of manufacturing magnetic recording medium, magnetic recording medium, and magnetic recording and reproducing apparatus

A method for manufacturing a magnetic recording medium is provided. An orientation control layer is deposited on a non-magnetic substrate to control an orientation of a layer located directly thereon, and a perpendicular magnetic layer whose easy axis of magnetization is mainly oriented perpendicular to the non-magnetic substrate is deposited thereon. In depositing the orientation control layer, a first granular structure layer containing Ru or a material mainly made of Ru and a first oxide having a melting point of 1000 degrees C. or lower are deposited by sputtering. In depositing the perpendicular magnetic layer, a second granular structure layer containing magnetic particles and a second oxide having a melting point of 1000 degrees C. or lower are deposited by sputtering, and the magnetic particles are grown so as to form a columnar crystal continuing in a thickness direction. The columnar crystal includes crystal grains constituting the orientation control layer.

Method for manufacturing magnetic recording medium, magnetic recording medium and magnetic recording and reproducing apparatus

The present invention provides a method for manufacturing a magnetic recording medium by mounting a substrate for film formation on a carrier, sequentially transporting said substrate into a plurality of connected chambers, and forming at least a magnetic film and a carbon protective film on said substrate for film formation within said chambers, wherein said method comprises a step of conducting ashing to remove an accumulated carbon protective film adhered to a carrier surface, which is performed following a step of removing a magnetic recording medium from said carrier following film formation, but prior to a step of mounting a substrate for film formation on said carrier.

Method and apparatus for manufacturing magnetic recording medium

There are provided a method for manufacturing a magnetic recording medium which is excellent in terms of both the recording and reproduction characteristics and the thermal fluctuation characteristics without reducing the density and hardness of the perpendicular magnetic layer; a magnetic recording medium; and a magnetic recording and reproducing apparatus with which an excellent recording density is achieved,

Method for manufacturing magnetic recording medium, magnetic recording medium, and magnetic recording and reproducing apparatus

According to one embodiment, there is provided a thin magnetic film having a negative anisotropy of &#x2212;6&#xd7;10erg/cmor less and including, on at least a nonmagnetic substrate, at least one seed layer made of a metal or metal compound, a ruthenium underlayer for controlling the orientation of an immediately overlying layer, and a magnetic layer having negative anisotropy in the normal line direction perpendicular to a surface of the magnetic layer and mainly containing Co and Ir, wherein the additive element concentration of Ir in the magnetic layer is 10 (inclusive) to 45 (inclusive) at %.

Thin magnetic film, method of manufacturing the same, and high frequency oscillator, magnetic head, magnetic recording medium, and magnetic recording/reproducing apparatus using thin magnetic film

The present invention relates to a method for manufacturing a perpendicular magnetic recording medium including a nonmagnetic substrate, and at least a soft magnetic under layer, an orientation control layer, a magnetic recording layer constituted of two or more layers and a protective layer formed on the nonmagnetic substrate, the method including a step of forming a first magnetic recording layer having a granular structure constituted of ferromagnetic crystal grains and crystal grain boundaries made of a nonmagnetic oxide or nitride on the nonmagnetic substrate side, a step of forming a second magnetic recording layer constituted only of ferromagnetic crystal grains, a step of forming a surface unevenness control layer for decreasing surface unevenness of the first magnetic recording layer located between the first magnetic recording layer and the second magnetic recording layer, and a step of heating the nonmagnetic substrate so as to decrease a surface roughness Ra of the second magnetic recording layer to less than 2 nm. The present invention also relates to a magnetic recording and reproducing apparatus using the magnetic recording medium.

Method for manufacturing magnetic recording layer having two or more layers

A perpendicular magnetic recording medium including at least a soft under layer, an orientation control layer, a magnetic recording layer and a protective layer on a non-magnetic substrate, wherein the orientation control layer is composed of three or more layers including a seed layer, a first intermediate layer and a second intermediate layer sequentially, formed in that order from the substrate side, the crystal grains that constitute the first intermediate layer are epitaxially grown on the crystal grains of the seed layer, the crystal grains that constitute the second intermediate layer are epitaxially grown on the crystal grains of the first intermediate layer, and the crystal grains that constitute the second intermediate layer are finer than the crystal grains that constitute the first intermediate layer.

Perpendicular magnetic recording medium, method for producing the same, and magnetic recording/reproducing device

There is provided a manufacturing method of a magnetic recording medium that maintains a high level of perpendicular orientation of a perpendicular magnetic layer and enables to further increase high recording density, prepared such that at least on a non-magnetic substrate, there are laminated a soft magnetic base layer, an orientation control layerthat controls the orientation of the layer immediately thereabove, and a perpendicular magnetic layer with a magnetization easy axis thereof primarily oriented perpendicular to the non-magnetic substrate. The manufacturing method is characterized in that when configuring the perpendicular magnetic layer with two or more magnetic layerstoand crystal-growing each layer so that the crystal grains that constitute the respective magnetic layersto, together with the crystal grains that constitute the orientation control layer, form column-shaped crystals Sto Sin a consecutive manner in the thickness direction, lamination of the orientation control layeris performed while the substrate is being cooled or immediately after the substrate has been cooled.

Manufacturing method of magnetic recording medium and magnetic recording/reproducing apparatus

A magnetic recording medium is provided which can record and reproduce high-density information by maintaining perpendicular orientation of a magnetic recording layer even with a decrease in thickness of nonmagnetic layers from an intermediate layer to a seed layer while decreasing the grain size of magnetic crystal grains to be consistent with an increase in recording density. A manufacturing method thereof and a magnetic recording and reproducing apparatus are also provided. The magnetic recording medium is a perpendicular magnetic recording medium including at least an underlying layer, an orientation control layer, a magnetic recording layer, and a protective layer formed on a nonmagnetic substrate. Here, the orientation control layer includes two or more layers of a seed layer and an intermediate layer from the substrate side. Materials of the seed layer and the intermediate layer are selected so that a contact angle of the intermediate layer material with respect to the seed layer material, which is amorphous, is in the range of 10 to 100 degrees.

Magnetic recording medium and magnetic recording and reproducing apparatus

In a perpendicular magnetic recording medium in which at least a soft magnetic underlayer, an orientation control layer, a magnetic recording layer and a protective layer are formed on a non-magnetic substrate in order from the bottom, the orientation control layer has a laminated structure of two or more layers including an intermediate layer and a seed layer which is disposed closer to the non-magnetic substrate than the intermediate layer. The seed layer includes two or more kinds of elements having a face-centered cubic structure, has face-centered cubic (111) plane crystals oriented in a direction perpendicular to a substrate surface, and has a pseudo-hexagonal structure.

Magnetic recording medium, method of manufacturing magnetic recording medium and magnetic recording reproducing apparatus

The present invention provides a magnetic recording medium which is capable of improving the perpendicular orientation of a perpendicular magnetic recording layer while maintaining a writing performance during recording and obtaining both an improvement in the perpendicular orientation and fine magnetic crystal particles with a uniform diameter, and which enables information to be recorded or reproduced at high density, a method of manufacturing the same, and a magnetic recording/reproducing apparatus. A magnetic recording mediumaccording to the present invention includes at least a soft magnetic underlayer, an orientation control layer, a magnetic recording layer, and a protective layerformed on a non-magnetic substrate. The orientation control layerhas a seed layerand an intermediate layer. The seed layeris made of a Cu&#x2014;Ti alloy that has a face-centered cubic structure and includes Cu as a main component. The Cu&#x2014;Ti alloy has a (111) crystal plane oriented substantially perpendicular to the surface of the non-magnetic substrateand has a pseudo-hexagonal structure.

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Ichihara, Japan

Gohei Kurokawa